ASP.NET MVC and DataTables, cannot redirect to custom error page - datatables

Question

I have a problem when combining ASP.NET custom errors and use DataTables in a view.
If DataTables tries to get data from the server and an error occurs, first, the error is caught by ASP.NET MVC in Application_Error and from there it is passed to the Index action in the ErrorController with the exception information.
However, the error page is not displayed, instead the browser jumps to the DataTables error handling in javascript.
I can force the page to be displayed, as in the code below (window.location), but I would like the error page with the original exception to be displayed. If I omit the window.location part, no error page is displayed, even though the Index action in ErrorController is triggered.
Here is my code:
Global.asax:
protected void Application_Error(object sender, EventArgs e)
{
Exception exception = Server.GetLastError();
Server.ClearError();
// Redirect to error page
var routeData = new RouteData();
routeData.Values.Add("controller", "Error");
if (exception.GetType() == typeof(HttpException))
{
// Save error log
Log.WriteLog(exception, "", Session["userName"] as string);
var code = ((HttpException)exception).GetHttpCode();
if (code == 404)
{
routeData.Values.Add("action", "NotFound");
}
else if (code == 403 || code == 401)
{
routeData.Values.Add("action", "NotAuthorized");
}
else
{
routeData.Values.Add("action", "BadRequest");
routeData.Values.Add("statusCode", 400);
}
}
else
{
routeData.Values.Add("action", "Index");
routeData.Values.Add("statusCode", 500);
}
routeData.Values.Add("exception", exception);
// Redirect to error pages
Response.TrySkipIisCustomErrors = true;
IController controller = new ErrorController();
controller.Execute(new RequestContext(new HttpContextWrapper(Context), routeData));
Response.End();
}
ErrorController:
public ActionResult Index(dynamic exception, int? statusCode = 500)
{
Response.StatusCode = statusCode.Value;
Response.TrySkipIisCustomErrors = true;
ViewBag.Message = (exception is String[]) ? exception[0] : exception.Message;
return View("Error500");
}
DataTables error handling:
$.fn.dataTable.ext.errMode = 'throw';
$("#tblMSLs").on('error.dt', function (e, settings, techNote, message) {
console.log('Error in DataTables tblMSLs: ', message);
window.location.href = `${webOrigin}Error?exception=${message}&statusCode=500`;
});